CN215910750U - Lighting signal source - Google Patents
Lighting signal source Download PDFInfo
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- CN215910750U CN215910750U CN202121788617.6U CN202121788617U CN215910750U CN 215910750 U CN215910750 U CN 215910750U CN 202121788617 U CN202121788617 U CN 202121788617U CN 215910750 U CN215910750 U CN 215910750U
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Abstract
The utility model relates to a lighting signal source for testing a liquid crystal screen, which is characterized by comprising the following components: a signal source substrate (10) on which an FPGA unit for supplying a lighting signal to the liquid crystal panel is mounted; and the power supply substrate (20) is used for supplying power to the liquid crystal screen, the signal source substrate and the power supply substrate are mutually independent substrates and are connected through a board-to-board connector or connected through a connecting wire.
Description
Technical Field
The present invention relates to a lighting signal source, and more particularly, to a lighting signal source for testing a liquid crystal panel (also referred to as a liquid crystal module).
Background
Before the liquid crystal screen is shipped from a factory, in order to detect the photoelectric parameters of the liquid crystal screen, a lighting signal source is generally used for carrying out a lighting test on the liquid crystal screen. In the prior art, a lighting signal source generally includes a signal source circuit and a power supply circuit, when a liquid crystal screen is subjected to a lighting test, the signal source circuit transmits RGB (red, green, blue) signals or LVDS (Low Voltage Differential Signaling) signals as lighting signals (test signals) to the liquid crystal screen, and the power supply circuit provides power to both the signal source circuit and the liquid crystal screen.
The signal source circuit and the power source circuit in the lighting signal source are usually integrated on one lighting signal source substrate. When the lighting signal source substrate fails during the lighting test of the liquid crystal screen by using the lighting signal source substrate, the whole lighting signal source substrate needs to be checked or maintained, and the problem of low working efficiency exists. Further, when one of the signal source circuit and the power source circuit in the lighting signal source is broken down and needs to be replaced, only the broken circuit cannot be replaced, and the entire lighting signal source substrate needs to be replaced, which causes unnecessary waste.
In addition, the RGB signals have poor anti-electromagnetic interference capability compared to the LVDS signals. When a signal source circuit and a power source circuit in a lighting signal source are integrated on one lighting signal source substrate, RGB signals in the signal source circuit are easily affected by the power source circuit.
SUMMERY OF THE UTILITY MODEL
The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a lighting signal source which is easy to check or repair a failure, easy to replace a failed circuit board, and capable of preventing RGB signals from being affected by a power supply circuit.
A first aspect of the present invention is a lighting signal source for testing a liquid crystal panel, including: a signal source substrate on which an FPGA unit for supplying a lighting signal to the liquid crystal panel is mounted; and the signal source substrate and the power source substrate are mutually independent substrates and are connected through a board-to-board connector (also called a B to B connector) or connected through a connecting wire.
In the utility model according to claim 2, a first power supply for supplying power to the FPGA unit is mounted on the signal source substrate, and a second power supply for supplying power to the liquid crystal panel is mounted on the power source substrate
A third aspect of the present invention is the lighting signal source according to the first aspect of the present invention, wherein the second power supply on the power supply substrate supplies power to the liquid crystal panel through the signal source substrate, and the FPGA unit transmits an enable signal for powering on or off the liquid crystal panel by the second power supply to the power supply substrate.
A 4 th aspect of the present invention is the lighting signal source of the 3 rd aspect, wherein the signal source substrate has a first interface and a second interface, the power source substrate has a third interface and a fourth interface, the first interface is connected to the third interface, the second interface is connected to the fourth interface, and an enable signal from the FPGA unit is transmitted to the power source substrate via the first interface.
A 5 th aspect of the present invention is the lighting signal source according to the 4 th aspect, wherein the signal source substrate has a fifth interface, the signal source substrate outputs RGB signals as the lighting signal to the liquid crystal panel through the fifth interface, and the power source substrate supplies power to the liquid crystal panel through the fourth interface, the second interface, and the fifth interface in this order.
A 6 th aspect of the present invention is the lighting signal source of the 5 th aspect, wherein a buffer for adjusting a level of the RGB signal is provided between the FPGA unit and the fifth interface on the signal source substrate.
A 7 th aspect of the present invention is the lighting signal source of the 2 nd aspect, wherein the voltages supplied to the liquid crystal panel by the second power supply on the power supply substrate include a power supply voltage, a backlight voltage, a positive side analog power supply voltage, a negative side analog power supply voltage, a gate-on voltage, and a gate-off voltage
An 8 th aspect of the present invention is the lighting signal source of the 2 nd aspect, wherein the first power supply on the signal source substrate includes a first DC-DC converter, and the second power supply on the power source substrate includes a second DC-DC converter
A 9 th aspect of the present invention is the lighting signal source according to the 8 th aspect, wherein the second DC-DC converter includes a varistor for adjusting an output voltage of the second DC-DC converter.
Effect of the utility model
As described above, in the lighting signal source according to the present invention, since the signal source substrate and the power source substrate are independent (i.e., separate) substrates, when the lighting signal source fails, the signal source substrate and the power source substrate can be inspected and maintained, respectively, and the operating efficiency can be improved. In addition, when one of the signal source substrate and the power source substrate is broken down and needs to be replaced, only the broken substrate needs to be replaced, and the whole lighting signal source does not need to be replaced, so that unnecessary waste can be avoided.
In the lighting signal source of the present invention, since the signal source substrate and the power source substrate are independent substrates, the RGB signals transmitted on the signal source substrate are less susceptible to the power source mounted on the power source substrate for supplying power to the liquid crystal panel.
In the lighting signal source of the present invention, since the signal source substrate has a dedicated power supply (the first power supply in the present invention), when the FPGA unit on the signal source substrate is started to program, only the dedicated power supply on the signal source substrate needs to be started, and other power supplies (for example, a power supply mounted on the power supply substrate for supplying power to the liquid crystal panel) do not need to be started.
In the lighting signal source according to the present invention, since the DC-DC converter in the power supply for supplying power to the liquid crystal panel mounted on the power supply substrate has the varistor for adjusting the output voltage of the DC-DC converter, the magnitude of the output voltage can be adjusted by changing the resistance value of the sampling resistor by the varistor, and the voltage supplied to the liquid crystal panel can be changed, so that various types of liquid crystal panels having different driving voltages can be tested.
Drawings
Fig. 1 is a block diagram of a lighting signal source of the present invention.
Fig. 2 is a schematic diagram showing a specific connection relationship in the lighting signal source of the present invention.
Fig. 3 is a schematic diagram showing a connection relationship between a lighting signal source and a liquid crystal panel as a test object according to the present invention.
Detailed Description
Next, a lighting signal source according to the present invention will be described. The following description is given for the convenience of understanding the lighting signal source of the present invention, and is not intended to limit the lighting signal source of the present invention, and the lighting signal source of the present invention does not necessarily need to have all the technical features described. The range of the lighting signal source of the present invention is limited according to the technical means described in the contents of the present invention.
Fig. 1 is a block diagram of a lighting signal source of the present invention. Fig. 2 is a schematic diagram showing a specific connection relationship in the lighting signal source of the present invention. The upper part of fig. 2 is a block diagram of the signal source substrate 10 included in the lighting signal source of the present invention, and the lower part of fig. 2 is a block diagram of the power source substrate 20 included in the lighting signal source of the present invention.
As shown in fig. 1 and 2, a lighting signal source 1 of the present invention includes a signal source substrate 10 and a power source substrate 20, an FPGA (Field Programmable Gate Array) unit 11 for supplying a lighting signal to a liquid crystal panel is mounted on the signal source substrate 10, the power source substrate 20 supplies power to the liquid crystal panel, and the signal source substrate 10 and the power source substrate 20 are independent substrates and are connected to each other through a board-to-board connector or a connection line. The connection line is, for example, a Cable such as an FFC (Flexible Flat Cable).
The signal source substrate 10 has interfaces 17a and 17b, the power source substrate has interfaces 27a and 27b, and the signal source substrate 10 and the power source substrate 20 are connected by connecting the interface 17a and the interface 27a with a board-to-board connector or a connecting wire and connecting the interface 17b and the interface 27 b.
The signals transmitted from the interface 17a of the signal source substrate 10 to the interface 27a of the power source substrate 20 include a VCC _ EN signal, a BL _ EN signal, an AVDDM _ EN signal, an AVDDP _ EN signal, a VGH _ EN signal, and a VGL _ EN signal. Here, VCC is an abbreviation of Volt Current concentrator, EN is an abbreviation of Enable, BL is an abbreviation of Backlight, AVDDP denotes a positive side analog power supply voltage, AVDDM denotes a negative side analog power supply voltage, VGH denotes a gate-on voltage, and VGL denotes a gate-off voltage.
The signal source substrate 10 is mounted with DC/ DC converters 15a, 15b, 15c, 15d, and 15e, converts a 12V DC voltage from the power supply 14 into a 2.5V DC voltage via the DC/ DC converters 15a, 15b, and 15d and supplies the converted voltage to the FPGA unit 11, converts a 12V DC voltage from the power supply 14 into a 1.2V DC voltage via the DC/ DC converters 15a, 15b, and 15e and supplies the converted voltage to the FPGA unit 11, and converts a 12V DC voltage from the power supply 14 into a 3.3V DC voltage via the DC/ DC converters 15a and 15c and supplies the converted voltage to the FPGA unit 11.
The DC/ DC converters 15a, 15b, 15c, 15d, and 15e on the signal source substrate 10 correspond to "a first power supply for supplying power to the FPGA unit" in the disclosure of the present invention.
As shown in fig. 2, 4 DC/ DC converters 25a, 25b, 25c, and 25d are mounted on the power supply board 20, and a predetermined voltage can be output from the respective DC/ DC converters 25a, 25b, 25c, and 25 d. The 4 DC/ DC converters 25a, 25b, 25c, and 25d on the power supply board 20 correspond to "a second power supply for supplying power to the liquid crystal panel" in the disclosure of the present invention.
As shown in fig. 2, the voltages output from the DC/ DC converters 25a, 25b, 25c, 25d on the power substrate 20 include a VCC voltage, a BL voltage, an AVDDM voltage, an AVDDP voltage, a VGH voltage, and a VGL voltage. The FPGA unit 11 can control power supply/power off of the power supply substrate 20 to/from the liquid crystal frequency by the enable signals (i.e., VCC _ EN signal, BL _ EN signal, AVDDM _ EN signal, AVDDP _ EN signal, VGH _ EN signal, VGL _ EN signal) described above.
Since the driving voltages required for the respective liquid crystal panels are generally different from each other due to the variety of the liquid crystal panels, the DC/ DC converters 25a, 25b, 25c, and 25d may be configured such that the output voltages thereof are adjustable in order to satisfy the driving voltages required for the respective liquid crystal panels. Specifically, a varistor (varistor circuit) may be added to each of the DC/ DC converters 25a, 25b, 25c, and 25 d. The magnitude of the output voltage of each of the DC/ DC converters 25a, 25b, 25c, 25d is adjusted by changing the resistance value of the sampling resistor by the varistor. Thus, the output voltage values of the DC/ DC converters 25a, 25b, 25c, and 25d can be adjusted according to the type of the liquid crystal panel.
In the signal source substrate 10 shown in fig. 2, 5 DC-DC converters 15a to 15e are provided as a power source dedicated to the signal source substrate 10. However, this is merely an example, and a number of DC-DC converters other than 5 may be provided as long as the matching with the FPGA unit 11 is possible. In the power supply board 20 shown in fig. 2, 4 DC-DC converters 25a to 25d are provided as power supplies for supplying power to the liquid crystal panel. This is also an example, and the number of DC-DC converters other than 4 may be provided as long as the DC-DC converters can be matched with the liquid crystal panel to be tested.
When the liquid crystal screen is tested, an external test signal is transmitted to the FPGA unit 11 on the signal source substrate 10 through the JTAG interface 13. After receiving the external test signal from the JTAG interface 13, the FPGA unit 11 provides an RGB image test signal according to configuration information of the liquid crystal panel, and outputs the RGB image test signal to the liquid crystal panel through the interface 17 c. Wherein JTAG is a shorthand for Joint Test Action Group.
A buffer 16 may be further provided between the FPGA unit 11 and the interface 17c, and the buffer 16 is used to adjust the level of the RGB signals from the FPGA unit 11 to eliminate the attenuation of the RGB signals.
The signal source substrate 10 is also mounted with an SW/LED module 12. Where "SW" denotes a control Switch (Switch), and the LED denotes a light emitting diode as an indicator lamp. The control switches are generally four, namely, ON/OFF, UP, DOWN, and automatic circulation.
When the liquid crystal screen is tested by using the lighting signal source, the liquid crystal screen is mainly tested by using the lighting signal source of a plurality of pictures. The control switch of "" ON/OFF "" is used to turn ON/OFF the picture, the control switch of "" UP "" is used to turn ON the previous picture, the control switch of "" DOWN "" is used to turn ON the next picture, and the control switch of "" auto-cycle "" is used to make each picture automatically cycle and play. "LEDs" are used to indicate the status of the various control switches.
Next, a case of testing a liquid crystal panel by using the lighting signal source of the present invention will be described.
Fig. 3 is a schematic diagram showing a connection relationship between a lighting signal source and a liquid crystal panel as a test object according to the present invention.
As shown in fig. 3, when a liquid crystal panel (liquid crystal module) is tested by using the lighting signal source of the present invention, the power supply substrate 20 supplies power to the lighting substrate and the liquid crystal panel through the signal source substrate 10, and the signal source substrate 10 transmits a test signal to the liquid crystal panel through the lighting substrate.
As described above, in the lighting signal source 1 of the present invention, since the signal source substrate 10 and the power source substrate 20 are independent substrates, when the lighting signal source is out of order, the signal source substrate 10 and the power source substrate 20 can be inspected and maintained, respectively, and the operation efficiency can be improved. Further, when one of the signal source substrate 10 and the power source substrate 20 is broken down and needs to be replaced, only the broken substrate needs to be replaced, and the entire lighting signal source does not need to be replaced, so that unnecessary waste can be avoided.
In the lighting signal source of the present invention, since the signal source substrate 10 and the power source substrate 20 are independent substrates, the RGB signals transmitted on the signal source substrate 10 are less susceptible to the power source mounted on the power source substrate 20 for supplying power to the liquid crystal panel.
In the lighting signal source of the present invention, since the signal source substrate 10 has a dedicated power supply (i.e., the DC/ DC converters 15a, 15b, 15c, 15d, 15e), when the FPGA unit 11 on the signal source substrate is started up to perform programming, only the dedicated power supply on the signal source substrate needs to be started up, and other power supplies (e.g., the DC/ DC converters 25a, 25b, 25c, 25d mounted on the power supply substrate 20 for supplying power to the liquid crystal panel) do not need to be started up.
In the lighting signal source of the present invention, since the DC-DC converter in the power supply for supplying power to the liquid crystal panel mounted on the power supply substrate 20 has the varistor for adjusting the output voltage of the DC-DC converter, the magnitude of the output voltage can be adjusted by changing the resistance value of the sampling resistor by the varistor, and the voltage supplied to the liquid crystal panel can be changed, so that various types of liquid crystal panels having different driving voltages can be tested.
Depending on the liquid crystal panel, the connector type, terminal arrangement, and signal transmission method may be different, in addition to the case where the driving voltage is different. In order to match the lighting signal source of the present invention with the liquid crystal panel, it is necessary to match the output interface 17c of the signal source substrate 10 with the input interface of the lighting substrate and match the output interface of the lighting substrate with the input interface of the liquid crystal panel. In order to achieve such a matching, a corresponding matching circuit can be provided on the lamp substrate.
For example, in the case where the image test signal transmitted from the lighting signal source of the present invention is an RGB signal and the liquid crystal panel as the test target receives an LVDS signal without receiving the RGB signal, an RGB/LVDS conversion circuit for converting the RGB signal into the LVDS signal may be provided on the lighting substrate in order to achieve matching between the lighting signal source and the liquid crystal panel.
In the case where a special power supply is required for the liquid crystal panel, a corresponding process (for example, a gradation voltage circuit) may be performed on the lighting substrate.
When the signal voltage attenuation is large due to an excessively long connection line (for example, a cable such as an FFC) between the lighting signal source (signal source substrate) and the lighting substrate, a Buffer (Buffer) may be added to the lighting substrate to boost the signal voltage.
In addition, an ESD (Electro-Static discharge) circuit may be added to the lighting substrate to prevent Static electricity.
In the present invention, the liquid crystal panel as a test target is a vehicle-mounted liquid crystal panel, but may be another liquid crystal panel.
While the utility model has been described in detail in connection with the drawings and the embodiments, it should be understood that the above description is not intended to limit the utility model in any way. Those skilled in the art can make modifications and variations to the present invention as needed without departing from the true spirit and scope of the utility model, and such modifications and variations are within the scope of the utility model.
Claims (9)
1. A lighting signal source for testing a liquid crystal display, comprising:
a signal source substrate on which an FPGA unit for supplying a lighting signal to the liquid crystal panel is mounted; and
a power supply substrate for supplying power to the liquid crystal panel,
the signal source substrate and the power source substrate are independent substrates, and are connected through a board-to-board connector or connected through a connecting wire.
2. The lighting signal source of claim 1 wherein:
a first power supply for supplying power to the FPGA unit is mounted on the signal source substrate,
and a second power supply for supplying power to the liquid crystal display is arranged on the power supply substrate.
3. The lighting signal source of claim 2 wherein:
the second power supply on the power supply substrate supplies power to the liquid crystal screen through the signal source substrate,
and the FPGA unit transmits an enabling signal for enabling the second power supply to supply power or cut off power to the liquid crystal display to the power supply substrate.
4. The lighting signal source of claim 3 wherein:
the signal source substrate is provided with a first interface and a second interface, the power source substrate is provided with a third interface and a fourth interface, the first interface is connected with the third interface, the second interface is connected with the fourth interface,
and enabling signals from the FPGA unit are transmitted to the power supply substrate through the first interface.
5. The lighting signal source of claim 4 wherein:
the signal source substrate has a fifth interface,
the signal source substrate outputs RGB signals as the lighting signal to the liquid crystal panel via the fifth interface,
the power supply substrate supplies power to the liquid crystal screen through the fourth interface, the second interface and the fifth interface in sequence.
6. The lighting signal source of claim 5 wherein:
and a buffer for adjusting the level of the RGB signals is arranged between the FPGA unit and the fifth interface on the signal source substrate.
7. The lighting signal source of claim 2 wherein:
the voltage provided by the second power supply on the power supply substrate to the liquid crystal screen comprises a power supply voltage, a backlight voltage, a positive side analog power supply voltage, a negative side analog power supply voltage, a grid connection voltage and a grid disconnection voltage.
8. The lighting signal source of claim 2 wherein:
the first power supply on the signal source substrate includes a first DC-DC converter,
the second power supply on the power substrate includes a second DC-DC converter.
9. The lighting signal source of claim 8 wherein:
the second DC-DC converter has a varistor for regulating an output voltage of the second DC-DC converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121788617.6U CN215910750U (en) | 2021-08-03 | 2021-08-03 | Lighting signal source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121788617.6U CN215910750U (en) | 2021-08-03 | 2021-08-03 | Lighting signal source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215910750U true CN215910750U (en) | 2022-02-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121788617.6U Active CN215910750U (en) | 2021-08-03 | 2021-08-03 | Lighting signal source |
Country Status (1)
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|---|---|
| CN (1) | CN215910750U (en) |
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2021
- 2021-08-03 CN CN202121788617.6U patent/CN215910750U/en active Active
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